("Arrancar Arc" version)

Aizen is a main antagonist from the series Bleach. He is a Soul Reaper who defected from the Soul Society with ambitions of achieving godhood surpassing that of the Soul King. Sometime in the past his fascination with the creation of the Hogyoku led to him to experimenting in secret with Hollowfication of subjects. He'd rise in the ranks to being captain and would later betray those he worked for and orchestrate an Arrancar army in the world of the hollows, awaiting to create the very key using the souls of Karakura town's inhabitants on his path to godhood.

Aizen appears as a middle aged man with brown hair combed back and a strand along the front of his face, also having brown eyes. He wears an outfit reminiscent of the Arrancar being an all white haori over a white shihakusho and hakama, both of which have a raised collar.

As a former Soul Reaper he is known for one of the highest spirit energies due to his bond with the Hogyoku within him. An exceptional user of Kido he also utilizes the hypnotic power of his zanpakutou "Kyoka Suigetsu" which can trick all known senses of his target by merely revealing his sword, the bankai of which is unknown. Those that bear witness to it are supposedly permanently under its effect unless he undoes it willingly.